SiO2负载磷钨酸铯盐催化剂上香兰素与1，2-丙二醇的缩合反应  

Condensation reaction of vanillin with 1,2-propanediol over silica supported cesium phosphotungstate catalysts

作　　者：沈传磊[1] 刘平[1] 王军[1] 

机构地区：[1]南京工业大学化学化工学院,材料化学工程国家重点实验室,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2010年第2期22-25,30,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20476046)

摘　　要：制备一系列硅胶(SiO2)负载的磷钨酸铯盐催化剂,将其用于香兰素与1,2-丙二醇的缩合反应,合成香兰素丙二醇缩醛,考察催化剂中Cs+取代数、磷钨酸铯盐负载量、催化剂用量、1,2-丙二醇与香兰素摩尔比及反应时间对缩合反应的影响.结果表明:磷钨酸铯盐的Cs+取代数为2.5、负载量为40%时催化剂活性最高;在反应温度368 K、n(1,2-丙二醇)/n(香兰素)=2.4、催化剂用量占反应体系质量分数1.5%、带水剂苯的用量30 mL、回流反应3 h的条件下,香兰素的转化率达到86.6%,香兰素丙二醇缩醛的选择性为100%.A series of cesium phosphotungstate catalysts supported on silica gel （ SiO2 ） were prepared and used to catalyze the condensation reaction of vanillin with 1,2-propanediol into vanillin propylene glycol acetal. Effects of substituted number of Cs^＋ , loading of cesium phosphotungstate, catalyst amount, mole ratio of 1,2-propanediol to vanillin, and reaction time on the reactivity were investigated. Results showed that the catalyst with Cs ^＋ substituted number of 2.5, and Cs salt loading of 40% exhibited the highest activity. Under optimal reaction conditions, i. e. , reaction temperature 368 K, mole ratio of 1,2-pro- panediol to vanillin 2.4, catalyst mass fraction in reaction medium 1.5 % , 30 mL benzene as water removal additive, and reaction time 3 h, the conversion of vanillin was 86.6% and the selectivity for vanillin propylene glycol aeetal was 100%.

关 键 词：磷钨酸铯盐 香兰素 杂多酸 硅胶 1 2-丙二醇 

分 类 号：TQ426.91[化学工程]